BRITISH STANDARD BS EN 12079 1 2006 Offshore containers and associated lifting sets — Part 1 Offshore containers — Design, manufacture and marking The European Standard EN 12079 1 2006 has the status[.]
General
An offshore container must possess adequate strength to facilitate loading and unloading from supply vessels in offshore conditions, specifically in a sea state with significant wave heights of up to 6 meters, while also being able to endure impacts from heavy seas.
NOTE Local impacts, e.g from hitting other deck cargo or rigid parts of the ship structure, may cause extreme loads in such conditions
To ensure stability on a moving deck, containers must be engineered to resist tipping at angles of up to 30° in any direction This design requirement applies when the containers are loaded to their maximum gross mass, with the center of gravity assumed to be at half the container's height For specialized containers, such as bottle racks and tank containers, the actual center of gravity must be taken into account.
To ensure safety and efficiency, offshore containers should be designed without protruding parts that could snag on other containers or structures Features such as door handles and hatch cleats must be strategically positioned or adequately protected to prevent interference with the lifting set.
Containers intended for stacking must have protective measures for exposed lifting sets that hang over the top frame This can include raised corners that extend sufficiently above the frame and roof to prevent accidental contact and potential damage to the lifting equipment.
Containers must be designed as structural frames (primary structure) with non-load bearing cladding (secondary structure) when necessary Design calculations should focus solely on the primary structure; however, for specific container types, such as waste skips with trapezium-shaped sides and a non-stressed cover above the bracing where pad eyes are attached, the entire structure can be treated as a primary structure In such cases, design calculations may consider the container as a monocoque construction.
5.1.6 T D shall not be higher than the (statistically) lowest daily mean temperature for the area where the offshore container is to operate and in no case shall be higher than -20 °C
NOTE 1 For containers with exposed aluminium, the danger of sparks caused by the impact of aluminium against corroded steel (the thermite reaction) should be taken into account
When specifying a service container, it is recommended to select a rating that exceeds the estimated fitted out mass This approach accommodates potential changes in the equipment's weight and quantity throughout the container's operational life, and it also provides the flexibility to transport a certain amount of non-permanent equipment.
NOTE 3 For containers with special features, additional design requirements may apply See informative Annex for guidance.
Structural strength
The required strength of a container shall be determined by calculation and verified by type tests, as described in Clause 7
5.2.2.1 For design loads defined in 5.2.2.2 and 5.2.2.3, no equivalent stress level, σ e , shall exceed the figure calculated as σ e = 0,85C , where: for steel: C = R e for aluminium: Base material C R = 0.2
Rm is the tensile strength of aluminium β is 0,8 for ISO AlMg4,5Mn-HAR/AA5083-H32 β is 0,7 for all other aluminium alloys and tempers
The design force on the primary structure shall be calculated as 2,5 Rg g is the acceleration due to gravity (in m/s 2 i.e 9,80665)
The internal load shall be taken as (2,5 R - T)g evenly distributed over the container floor For tank containers, the actual distribution of the tare mass shall be used for the calculations
Pad eyes shall be designed for a total vertical force of 3 Rg
The force shall be considered to be evenly distributed between (n - 1) pad eyes where n is the actual number of pad eyes
To calculate the sling force on the pad eyes, it is essential to consider the sling angle The resulting sling force on each pad eye can be determined using this angle in the calculations.
The sling force, denoted as F in newtons, is determined by the number of pad eyes, represented by n, which must be between 2 and 4 for calculation purposes Additionally, the angle v between a sling leg and the vertical is typically assumed to be 45 degrees unless specified otherwise.
For containers with only one pad eye, that pad eye shall be designed for a total vertical force of 5
Containers without a roof may lack the necessary strength and stiffness to pass the 2-point lifting test (7.3.3) To prevent the development of prototypes that fail this test, it is essential to verify an open top container's capacity to handle the load during the 2-point lifting test through appropriate calculations These calculations must ensure that the nominal yield stress of the material is not exceeded, but they do not substitute for actual prototype testing.
The weight of the lifting set shall be taken into account when calculating the strength of the fork pockets
The design force on the primary structure shall be calculated as 1,6 (R+S)g.
The internal load shall be taken as (1,6 (R+S)-T)g evenly distributed over the container floor
Where fork pockets are intended only for handling of the empty container, the design load shall be taken as 1,6 (T+S)g
Impact loads are short-duration dynamic loads that require verification of a container's ability to withstand them While dynamic calculations or tests are ideal, simplified static calculations as outlined in sections 5.2.3.2 and 5.2.3.3 are often sufficient Additionally, conducting a drop test for vertical impact on corners, as specified in section 7.4, is recommended.
When simplified calculations are used, and each beam is considered separately, any assumptions concerning support conditions shall be stated
The main frame structure must be designed to endure a local horizontal impact force applied at any point, which can act in any horizontal direction on the corner post For all other frame members on the sides, the load can be treated as acting perpendicularly to the side.
The calculated (static equivalent) stresses due to impact shall be combined with the lifting stresses resulting from static lifting forces ( Rg )
Equivalent stresses shall not exceed: σe = C (see 5.2.2.1)
The following values shall be used for the static equivalents to an impact force:
For container posts and side rails of the bottom structure: - 0,25 Rg
For other frame members of the side structure, including the top rails: - 0,15 Rg
Maximum calculated deflections at these loadings shall not exceed:
For corner posts and bottom side rails 1
1 n is the total length of the rail or post in mm
1 n is the length of the shortest edge of the wall being considered
NOTE 1n is a (nominal) reference length and will often be different from the actual span of a beam
For horizontal impact on tank containers for dangerous cargoes see 5.5.4
A vertical impact test must be conducted as specified in section 7.4 Furthermore, the side and end rails of the base should be capable of withstanding vertical point forces of 0.25 Rg at the center span.
Equivalent stresses shall not exceed: e C σ = (see 5.2.2.1)
Calculated deflections shall not exceed:
1 n is the total length of the rail
Maximum vertical impact forces are most likely to occur when a container is lowered onto the deck of a heaving supply vessel, especially if the deck is angled, leading to an initial impact on a corner These dynamic impact forces are difficult to simulate with static forces Therefore, it is generally adequate to confirm the strength through a vertical impact test as outlined in section 7.4.
5.2.4 Internal forces on container walls
Each container wall, including the doors, shall be designed to withstand an internal force of 0,6 Pg evenly distributed over the whole surface, without suffering any permanent deformation
The minimum material thickness (t) requirements for container components are as follows: external parts of corner posts and bottom rails must have a thickness of 6 mm for a load rating (R) of 1000 kg or more, and 4 mm for R less than 1000 kg All other primary structure parts require a thickness of 4 mm, while secondary structures made from metallic materials need a thickness of 2 mm Additionally, for monocoque design waste skips, a thickness of 6 mm is required within 100 mm from the side edges, and 4 mm for the remaining parts of the side structure.
The thicknesses may need to be increased to accommodate special considerations, including rating, design requirements, corrosion allowances, and the necessity for material impact tests.
Welding
Essential and non-redundant primary structural members shall be welded with full penetration welds
For other primary structure, the use of fillet welds shall be justified by design appraisal (including calculations and consideration of failure modes)
Intermittent fillet welding of secondary structure is acceptable, however care shall be taken to avoid corrosion.
Additional design details
Containers liable to fill with water, e.g open topped, shall have a suitable drainage facility
Doors and hatches, along with their hinges and locking mechanisms, must be engineered to withstand horizontal forces equivalent to those of the primary structure Locking devices must ensure that doors remain securely closed during transport and lifting For double doors, it is essential to have at least one locking device on each door that connects directly to both the top and bottom frame.
Locking arrangements shall be protected to prevent dislodgement by impact
Hinges shall be protected against damage from impact loads
Doors shall be capable of being secured in the open position
If weathertightness is required, the doors shall be equipped with seals
When intermediate cargo decks are fitted they shall be designed to withstand a force of at least 0,5 Pg Ψ, uniformly distributed where: Ψ is the dynamic factor (= 3)
When intermediate cargo decks are designed to support other than half the total payload, the design requirement shall be calculated accordingly
Containers for general cargo shall have internal securing points Each shall be designed to withstand a force of at least 10 kN
NOTE 1 A minimum of 12 is recommended.
NOTE 2 Hinge type lashing points are preferred.
Forklift pockets must be integrated into the bottom structure with a closed top, allowing them to pass through the base Additionally, they should include mechanisms to prevent the container from toppling off the forks.
Special requirements exist for fork pockets on tank containers carrying dangerous cargoes While the bottom face of the pocket can be fully closed, it is advisable to include openings for maintenance purposes This helps reduce the risk of loose items accumulating in the pockets, which could hinder the penetration of fork tines or cause damage to the edges of the cut-out.
The minimum internal dimensions of the forklift pockets shall be 200 mm x 90 mm
Forklift pockets shall be located such that the container is stable during handling and driving with forklift truck Container length, height, width and rating shall be taken into account
Pockets shall be located as far apart as practicable but need not be more than 2050 mm apart from the centre of pocket to centre of pocket
If a container is fitted with pockets that are only for empty handling, the container shall be marked according to 9.1
All open frame containers and open top containers with permanent internal fittings, machinery, or installations that may be susceptible to snagging by crane hooks or forerunners must have their tops protected with grating or plates This protection can be fixed, hinged, or removable, and it must be capable of being secured.
In order to prevent lateral bending moments on pad eyes, they shall be aligned with the sling to the centre of lift, with a maximum manufacturing tolerance of ± 2,5
Any difference in the diagonal measurements between lifting point centres shall not exceed 0,2 % of the length of the diagonal, or 5 mm, whichever is the greater
The diameter of pad eye holes must correspond to the shackle used, ensuring that the clearance between the shackle pin and the pad eye hole does not exceed 6% of the nominal shackle pin diameter Additionally, the maximum concentrated stresses at the edges of the holes should not surpass 2 times the yield strength (Re) at the design load.
NOTE 1 It is recommended that the clearance actually provided be as close as practicable to the 6% limit
The tolerance between pad eye thickness and inside width of shackle shall not exceed 25 % of the inside width of the shackle
Pad eyes shall be so designed as to permit free movement of the shackle and sling termination without fouling the pad eye
Pad eyes must remain within the container's boundaries, extending only vertically upward, and should be designed to minimize damage from other containers Additionally, lifting points should be strategically placed to reduce the risk of slings becoming entangled with the container or its cargo during regular operations.
Pad eyes must be welded to the frame using full penetration welds to ensure structural integrity When lifting forces are applied, it is essential that the plates possess specified through-thickness properties to effectively transfer these forces.
NOTE 2 It is recommended that pad-eyes be slotted into the primary structure
NOTE 3 Where ISO-corner fittings are mounted in conjunction with pad eyes, the corner fittings are not intended for lifting with slings offshore
Designers must be aware of the restrictions on permissible shackle types as outlined in EN 12079-2, particularly the preference for bow shackles featuring a bolt-type pin with a hexagon head, hexagon nut, and split cotter pin It is essential for designers to ensure adequate clearance around the pad eye to facilitate the fitting and removal of this preferred shackle type.
Where ISO-corner fittings are mounted to offshore freight containers they shall conform to ISO 1161 NOTE 1 Lifting offshore with shackles in these corner fittings is not acceptable
NOTE 2 Where an offshore container does not conform to the dimensional requirements of ISO 668 it is strongly recommended that ISO-corner fittings are not fitted to the top frame
Equipment on offshore containers shall be designed and installed to withstand the dynamic loading and other environmental forces to which it may be exposed
The following factors shall be used:
Design factor against breaking (safety factor) s = 2
NOTE Equipment permanently installed on a container is considered to be part of the container for certification purposes
Any external connections, e.g a supply of pressurized air, or an electrical connection, shall be protected against damage
Offshore containers shall be suitable for the offshore environment by means of construction, use of suitable material and/or corrosion and paint protection
All offshore container roofs, including those constructed from chequer plate, shall be coated with a permanent non-slip medium.
Tank containers
In addition to complying with other relevant design codes and requirements, tank containers shall be suitable for offshore service
In addition to the design requirements already specified in this standard, the frame shall be designed to protect the tank and equipment (valves, man-holes, etc.)
Tank design shall conform to the relevant sections of ISO 1496-3
Tanks designed for transporting dangerous cargo must comply with the IMDG Code and adhere to recognized pressure vessel standards They should be capable of withstanding lifting and impact loads, while also considering the effects of fluid surge in partially filled tanks.
NOTE The IMDG Code has restrictions for loaded handling of tanks over a certain length, by forklift
5.5.4 Impact protection on tank containers for dangerous cargoes
Tank containers for hazardous materials must have all components and fittings adequately safeguarded against impact damage In addition to the stipulations outlined in section 5.2.3, further requirements are also applicable.
To ensure safety, the top of the tank and its fittings must be safeguarded by beams, plates, or grating, with no component of the tank or its fittings extending within 100 mm of the top of the framework.
it shall not be possible for any part of the lifting set to foul fittings, manhole cleats or other protrusions on the tank;
Protective beams must be installed at or near the points where the tank shell is closest to the outer plane of the sides These beams should be positioned closely enough to ensure adequate protection.
At the maximum calculated elastic deflection of any side member, it is essential to maintain a minimum residual clearance of 10 mm between the member and any part of the tank shell or its fittings.
No components of the tank shell's underside, including sumps, bottom valves, or other fittings, should extend below 150 mm above the framework's bottom Additionally, any parts that reach within 300 mm of the framework's bottom must be safeguarded with beams or plating.
Tank containers designed with direct connection between the tank and the side or top frame elements shall be subject to special consideration.
Containers for bulk solids
Bulk containers shall be designed according to the relevant sections of ISO 1496-3 or ISO 1496-4 but shall in addition be suitable for offshore service
NOTE These may be either pressurized tanks or non-pressurized containers for gravity discharge
Steel — General
The chemical composition, heat treatment, weldability, mechanical properties, and impact energy characteristics must be appropriate for their intended use It is important to avoid the use of extra high strength steels with a yield strength exceeding 500 N/mm².
Materials that meet alternative standards may be utilized if their properties can be shown to be equivalent The standards mentioned in this clause will serve as the reference standards.
When materials of different galvanic potential are joined together, the design shall be such that galvanic corrosion is avoided
Welding consumables shall be according to the relevant European standards for welding consumables
Tensile testing shall be carried out according to EN 10002-1
To prevent brittle fracture initiation, it is essential for steels to have sufficient fracture energy Primary structure steels must undergo testing using the Charpy impact (V-notch) method.
EN 10045-1 Test temperatures shall be as given in Table 1
Table 1 — Charpy impact test temperature - Structural steel for primary structural members
Material thickness (t) in mm Impact test temperature in °C t≤ 12 T D + 10
The average energy absorption for base material specimens aligned parallel to the final rolling direction must meet the minimum values specified in Figure 1 In contrast, specimens oriented transversely to the final rolling direction should achieve energy absorption values that are two-thirds of those required for longitudinally oriented specimens.
Y specified minimum yield stress (RE), N/mm²
Rolled and extruded steels in offshore container structures
Welding steels must be produced using open hearth, electric furnace, or basic oxygen steel processes It is essential that the steels used in primary structures are killed and fine grain treated, ensuring the use of materials with non-ageing properties.
Structural steels for the primary structure shall be carbon steel, carbon-manganese steel, carbon-
For hot rolled plates and profiles, material grades specified in EN 10025, Parts 1-4, which meet the requirements in 6.1 and 6.2.1 shall be used
Hollow sections specified in EN 10210 or EN 10219, which meet the requirements in 6.1 and 6.2.1 shall be used
When required forged carbon and carbon-manganese steels shall be used in the offshore container structure
Such forgings shall be made from fully-killed and fine-grain treated non-ageing steel
NOTE It may be necessary to verify the non-ageing properties by tests
For the chemical and mechanical properties of alloy steels, refer to EN 10250-2 and EN 10250-3, which cover non-alloy quality, special steels, and alloy special steels for open die steel forgings The chemical composition must be appropriate for the specified thickness, and alloy steels should be supplied in a quenched and tempered state.
The impact test temperature shall be equal to the design air temperature, T D (see 4 and 5.1)
6.2.4 Steel castings in ISO-corner fittings
The tensile strength of ISO-corner fittings (see 5.4.8) made from cast steel shall be not less than
430 N/mm2 and the yield strength shall be not less than 220 N/mm2
The chemical composition shall be in accordance with that set out in Table 2 and mechanical properties shall be in accordance with Table 3
Table 2 — Chemical composition (ladle analysis) a
Cr+Ni+Cu+ Mo max
0,50 0,035 0,035 0,25 0,30 0,20 0,08 0,015 0,70 a The carbon equivalent shall not exceed 0,45% b Aluminium may be replaced partly or totally by other fine graining elements as stated in the approved specifications
Table 3 — Mechanical properties Mechanical properties
Yield strength Tensile strength Elongation Reduction of area Impact Energy
[N/mm 2 ] [N/mm 2 ] [%] (Joule) min min [%] min min at -20°C
220 430 to 600 25 40 27 a Average value on 3 ISO-V notch impact specimens acc to EN 10045-1 One individual value may be below the average value but shall not be lower than 70 % of the average.
Aluminium
The chemical composition, heat treatment, weldability and mechanical properties shall be suitable for the purpose
When materials of different galvanic potential are joined together, the design shall be such that galvanic corrosion is avoided
Aluminium alloys for offshore containers must be produced through rolling or extruding processes The alloys and tempers listed in Tables 4 and 5 are approved for use, while any alternative alloys or tempers require special consideration.
Table 4 — Aluminium alloys and tempers for rolled products
Table 4 — Aluminium alloys and tempers for rolled products
TF / T6 NOTE AA = American Aluminium Association
These references are included for information as users may encounter these references in practice
Table 5 — Aluminium alloys and tempers for extruded products
NOTE AA = American Aluminium Association
These references are included for information as users may encounter these references in practice.
Non-metallic materials
Timber, plywood, fibre reinforced plastics and other non-metallic materials shall not be used in primary structures
NOTE Consideration should be given to strength, durability, suitability and possible hazards caused by use of these materials.
Material certificates
Materials used for the construction of offshore containers shall be furnished with documentation in accordance with Table 6 All materials for primary structures shall be identifiable against the certificates
Table 6 — Documentation of materials Structure Documentation according to EN 10204
Inspection certificate 3.1.C Inspection certificate 3.1.B Test report 2.2
General
Any alterations in design, material specifications, or manufacturing methods that exceed standard tolerances and could affect the mechanical properties outlined in this standard must undergo relevant type testing on the modified container.
Type tests confirm that offshore containers meeting this standard exhibit the specified mechanical properties, validating their design, materials, and manufacturing methods.
For type testing, the chosen container must accurately represent the production units rather than being a hand-built pre-production model It should be constructed according to the specified plans and data, utilizing tooling that is similar to what will be used in future production.
The tests described in 7.3 and 7.4 are required for all offshore container types, and shall be considered as design requirements
NOTE 2 Type testing may not replace design review, but may in certain cases be a partial substitute for strength calculations Non-destructive examination (NDE) may be required after testing
The test masses should typically be evenly distributed within the container If it's not feasible to fit all the test mass inside, some can be positioned outside or beneath the container, as long as this arrangement simulates the loading conditions experienced during normal operation.
When a container features an additional cargo deck, the test mass or load must be evenly distributed between the floor and the additional deck, as outlined in section 5.4.3 If the additional deck is removable, testing should be conducted with the load divided between both the additional deck and the floor, as well as with the entire load placed solely on the floor.
NOTE 3 For containers with special features where additional design requirements apply, suitable tests should be made to verify that those requirements are met See informative Annex for guidance.
Test equipment and calibration
The test mass (or test load) shall be verified using calibrated weights or a calibrated load cell and handset
NOTE Examples of appropriate means of application of test mass/ test load are:
If a load cell and hand set is used it shall be calibrated annually, in accordance with EN ISO 7500-1, to an accuracy of ± 2 %
NOTE 1 Should a load cell be overloaded or receive a shock load (e.g from being dropped) it is recommended that the load cell and handset be re-calibrated before further use
Test blocks must be calibrated at least every two years following recognized international or national standards Each block's mass, measured in kilograms, should be clearly and permanently marked on its surface.
NOTE 2 Care should be taken in the storage of calibrated concrete blocks so as prevent the absorption of water having an influence on the actual block mass.
Lifting test
The container must be lifted using a lifting set at a design angle relative to the vertical, ensuring that it remains clear of the ground during the entire test.
When conducting a lifting test with the lifting set designed for the container, it is crucial to prevent any overloading, deformation, or distortion of the lifting equipment If the lifting set typically attached to the container is utilized for the test, a thorough visual inspection must be performed afterward to ensure its integrity.
The container shall be carefully lifted in such a way that no significant acceleration forces occur It shall be held for 5 minutes before measurements are taken
The container shall be loaded to give a total mass of 2,5 R and lifted clear of the ground, using all the pad eyes
NOTE This total mass may be obtained by putting in an internal test mass of 2,5R-T
No deflections during testing shall be greater than 1/300 of the span of the member The offshore container shall show no permanent deformation or other damage after testing
An offshore container fitted with four pad eyes shall also be lifted from only two pad eyes, situated diagonally opposite each other, with a total mass of 1,5 R
The offshore container shall show no permanent deformation or other damage after testing www.bzfxw.com
7.3.4 Post-lifting test inspection and examination
On completion of the lifting test, a non-destructive examination and visual inspection of the pad-eyes, shall be carried out.
Vertical impact test
The container, with its internal test mass corresponding to payload P, shall be either lowered or dropped on to a workshop floor of concrete or other rigid structure
NOTE 1 This floor may be covered with a sheathing of wooden planks with a thickness not exceeding 50 mm
When a container is lowered from a crane, the suspending wire and hook can reduce the impact compared to a free-fall drop test Consequently, the impact speed is likely to be higher during a lowering test.
The container must be positioned at an angle such that both the bottom side and end rails connected to the lowest corner create an angle of at least 5° with the floor.
However, the greatest height difference between the highest and lowest point of the underside of the container corners need not be more than 400 mm
The impacting corner shall be the one expected to have the lowest rigidity
NOTE 3 On closed dry cargo containers this will normally be at the door end
No significant permanent damage shall occur
NOTE 4 Cracks in welds and minor deformations may be repaired
One of the following procedures shall be carried out: a) Drop test
An internal load equal to the payload ( P ) shall be safely secured and the container shall be inclined as described above
The container must be suspended from a quick release hook and, upon release, should drop freely for a minimum distance of 50 mm to achieve an initial impact speed of at least 1 m/s Additionally, a lowering test is required.
An internal load equal to the payload ( P ) shall be safely secured and the container shall be inclined as described above
The container shall be lowered to the floor at a constant speed of not less than 1,5 m/s
NOTE 5 WARNING: These tests may cause considerable tremors in the building!
Other tests
Open top containers measuring 6.5m or more in overall length, equipped with fork pockets for loaded lifting, must be loaded to a uniformly distributed gross mass of 1.6(R+S)g During testing, these containers should be lifted clear of the ground using the fork pockets, ensuring that deflections do not exceed 1/300 of the member's span Additionally, the offshore container must exhibit no permanent deformation or damage following the testing process.
7.5.2 Tanks for dangerous cargoes shall be tested according to the requirements of the
General
Production shall be performed according to approved drawings, specifications and procedures
Production documents according to this standard shall be prepared and approved before production starts
The manufacturer shall ensure the quality of the procedures and facilities used through operation of a quality assurance system at least in accordance with EN ISO 9001.
Primary structure
During production, it is essential to identify the materials used in the primary structure and connect them to the relevant documentation If the markings on the finished product are not visible, a log must be maintained to ensure traceability of the materials utilized in the primary structure.
Welders shall be approved in accordance with EN 287-1 and EN ISO 9606-2, as appropriate to the materials being used
Approved welding procedures shall be used for the welding carried out on the primary structure
Preliminary welding procedure specifications shall form the basis for the preparation of welding procedure tests
Welding procedure specifications, tests, and approvals must comply with EN ISO 15607, EN ISO 15609-1, EN ISO 15614-1, or EN ISO 15614-2, along with the specified requirements.
Impact tests are essential for welding procedure tests, with specific test temperatures and results mandated by section 6.1 and Table 1 For materials thicker than 12 mm, four sets of impact tests must be conducted: one in the weld metal, one at the fusion line, one in the heat-affected zone (HAZ) 2 mm from the fusion line, and another 5 mm from the fusion line.
Welds shall be subject to visual examination as specified in Table 7
The percentages specified in Table 7 shall apply to the total length of weld for the type of structural assembly in question
Welds between essential non-redundant and non essential primary structures shall be examined as for non-essential primary structures
When fuel gas welding is applied, ultrasonic and magnetic particle examination shall be required in addition to radiographic examination
Table 7 — Non-destructive examination (NDE) of structural welds
Secondary structure 100 % a Dye penetrant examination shall be used where magnetic particle examination is not possible b Depending on material thickness and possibility
NOTE: The categories applicable to the structural members shall be agreed with the body certifying the container in each case.
8.2.4.2 Non-destructive examination (NDE) methods
When selecting NDE methods, it is essential to consider the conditions that affect their sensitivity, as outlined in Table 8 Structural welds must be inspected according to the guidelines provided in columns I to IV of Table 7, utilizing the methods specified in columns III or IV when applicable.
Table 8 — Standards relevant to NDE methods
Visual Magnetic particle Dye Penetrant Ultrasonic Radiography
EN 970 EN 1290 EN 571-1 EN 1714 EN 1435
Table 9 - NDE acceptance criteria Visual Magnetic Particle Dye Penetrant Ultrasonic Radiography
EN ISO 5817 a EN 1291 EN 1289 EN 1712 EN 12517-1
Level B Level 1 Level 1 Level 2 Level 1 a for aluminium EN 30042
8.2.4.4 Non-Destructive Examination (NDE) Operators
NDE operators shall be qualified, in accordance with EN 473, to a minimum of level 2
NDE operators shall undertake non-destructive examination in accordance with Table 7 and issue
number of repairs carried out to meet the specified acceptance standard;
NDE methods and procedures used;
NDE-parameters necessary for a proper assessment;
confirmation of acceptance or rejection.
Secondary structure
The fabrication procedure shall reflect the requirement that the secondary structure shall prevent cargo from falling out of the offshore container and, if required, prevent water from entering
Welds between primary and secondary structures shall be performed as for secondary structures and shall be examined as such
The welding procedure used for the secondary structure shall be in accordance with EN ISO 15607,
EN ISO 15609-1, EN ISO 15614-1 or EN ISO 15614-2 as appropriate.
Production testing
During the production of a batch of offshore containers, some, selected at random, shall be submitted to the all-point lifting test described in 7.3.2 and shall meet all specified requirements
The quantity of containers to be tested must be pre-determined and is based on the overall production series To establish the minimum number of containers for testing, including the one that underwent type testing, refer to Table 10.
Table 10 — Number of containers required for lifting test Total number in series Number to be tested a
≥ 40 10% a The quantity given includes the container which was type tested
If a type of offshore container is specified to be weatherproof, the following weatherproofness tests shall be carried out
For the prototype and 10 % of the containers in a production series, the test shall be carried out in accordance with the weatherproofness test specified in ISO 1496-1
For the remaining containers, the water test may be replaced by a simple light test for which the inspector shall proceed as follows:
enter the container, require the doors to be closed and allow sufficient time to become accustomed to the darkness (at least 3 minutes);
while a powerful light is directed at all external surfaces, examine the interior of the container for light penetration;
no light penetration shall be observable with the naked eye or with normally corrected vision
NOTE Appropriate provision should be made to ensure that there is no risk to the health and safety of the inspector
Failure of production containers
If a container fails to meet the weld acceptance criteria or lifting test requirements, the manufacturer must determine the cause of the failure and correct all affected containers After rectification, these containers must undergo re-inspection and/or re-testing.
Safety marking
The tops of closed containers and the top rails of open and framed containers shall be marked as follows:
closed containers shall be marked with a band of solid contrasting colour not less than
The roof perimeter must be 100 mm wide, and if the container's roof is recessed below the top perimeter rail, it is essential to mark at least the top surface of the rail.
open and framed containers, shall be marked on the top surface of the top rails with either hatching in a contrasting colour or a solid light colour
Containers equipped with fork pockets intended solely for handling when empty, such as certain tanks and long baskets, must prominently display the phrase "Empty lift only" near each set of fork pockets This warning should be in characters that are at least 50 mm high.
Aluminium containers should be clearly marked to indicate the risk of sparking, as outlined in section 5.1 It is recommended that the phrase 'ALUMINIUM CONTAINER' be displayed on all four sides in letters that are at least 75 mm high.
Identification markings
Each container shall have the fabricator's serial number welded on in characters at least 50mm high
Each container must display a unique identification number provided by the owner, serving as a primary reference for all certification and shipping documents related to its service.
The container number must be clearly and permanently visible on all sides of the container, as seen from ground level, using contrasting colors and characters that are at least 75 mm in height.
NOTE 1 For open sided containers it may be necessary to attach panels specifically to carry the container number
For containers with roofs, the container number must be prominently displayed on the roof in characters that are at least 300 mm high If space is limited, the characters should be as large as possible The marking should be clear to prevent misinterpretation, avoiding techniques like underlining Additionally, when applicable, the lower edge of the marking should be placed close to the side of the container.
In exceptional circumstances, the owner is permitted to change the container number and re-mark the container accordingly This necessitates the replacement of the inspection plate and a revision of the certificate of conformity.
Information markings
Each container shall be clearly marked with: a) relevant electrical hazard classification and zone marking according to ATEX Directive (94/9/EC) b) relevant dangerous goods placarding in accordance with the IMDG Code
Placarding must be removed once the container is empty of dangerous goods The maximum gross mass, tare mass, and payload, all measured in kilograms, should be clearly displayed in contrasting colors with a minimum height of 50mm.
A suitable matt black panel can be installed for displaying temporary information, ideally positioned on a door if available Additional details, such as the destination, can also be included as needed.
Other markings
When a container is equipped with an intermediate deck, the payload information must be clearly displayed on the inside of the container This display should be in a contrasting color and feature characters that are at least 50 mm high, ensuring visibility at all times.
The user of the container may add additional information marking such as owners name, etc However, to avoid misinterpretation additional marking shall be kept to a minimum
General
Containers shall be fitted with a plate carrying the information specified in 10.2
The plate must be constructed from corrosion-resistant material and securely affixed externally to prevent unauthorized or accidental removal It should be installed on a door or, for containers without doors, positioned prominently.
Aluminium rivets have been found to be unsuitable as a fixing method in the offshore environment and shall not be used
The information on the plate shall be in the English language
NOTE Provision for an additional language may be made
The text shall be permanently and legibly marked on the plates in characters not less than 4 mm high.
Contents of Data Plate
The plate shall be headed:
"OFFSHORE CONTAINER DATA PLATE — EN 12079-1:2006
The plate shall contain the following information:
month and year of manufacture;
maximum gross mass in kilograms excluding lifting set at the design sling angle;
payload in kilograms and intermediate deck payload (if applicable);
Identification of body issuing the certificate of conformity
NOTE 1 A recommended format for the plate is shown in Figure 2
NOTE 2 The data plate may be combined with the inspection plate by including the additional information specified in Clause 5 of EN 12079-3
Month and year of manufacture:
Maximum gross mass excluding lifting set kg at # # Degrees from Vertical
Figure 2 — Example of Data Plate Layout
General
All containers to be used offshore shall be issued with a certificate of conformity to this standard The certificate shall be retained by the owner
In addition, certificates of examination and tests shall be issued as described in 11.2
Containers, which are required to comply with the requirements of the IMDG Code, shall also be certified in accordance with the IMDG Code
Each container shall have its own fabricator's serial number as specified in 9.2.
Documentation
The certificate of conformity shall be based on the following documentation collated in an "as built" dossier, which shall be retained by the fabricator for at least five years:
drawings including a general arrangement drawing;
specifications for welding procedures (WPS);
report on traceability of materials, in the primary structure;
report from non-destructive examination (NDE);
It is advisable to transfer non-commercially sensitive information from the "as built dossier" to the owner, who should keep it for the duration of the container's life.
Contents of the certificate of conformity
The certificate of conformity shall contain the following information:
The container's specifications include its external dimensions, the number of lifting points, and the name of the fabricator, along with the month and year of fabrication It has a maximum gross mass of X kg, excluding the lifting set, and a tare mass of Y kg, also excluding the lifting set The payload capacity is Z kg, and there is a reference to the as-built dossier Additionally, the total mass for the all-points lifting test, as specified in section 8.4.1, is provided, along with the angle of the lifting set legs from vertical and the minimum nominal shackle bolt diameter.
conformity to other requirements and/or codes;
statement that the container described has been designed, fabricated and tested in accordance with EN 12079-1;
fabricator's serial numbers of those containers from the production batch subject to test in accordance to 8.4.1;
signature on behalf of the body issuing the certificate of conformity www.bzfxw.com
Various international and national certification schemes apply to different types of portable containers, including those relevant to offshore containers as defined by this standard.
General certification requirements for offshore containers
The International Maritime Organization IMO, has issued guidelines for certification of offshore containers, in circular MSC/Circ.860
This circular serves as a guide for national authorities in establishing approval and certification standards for offshore containers It emphasizes the importance of having new offshore containers approved, prototype tested, and certified by authorized organizations.
International Requirements for Freight Containers
Freight containers must be certified according to the International Convention for Safe Containers (CSC) While offshore containers typically do not fall under the CSC, those that meet the CSC's definition and are used internationally for cargo transport are required to obtain certification.
Tank Containers for Dangerous Goods
All tank containers intended for marine transport of dangerous goods need to be certified to the International Maritime Dangerous Goods Code (the IMDG Code) Tank containers built after January
Tank containers built and certified after 2003 must comply with the UN type tank requirements outlined in Chapter 6.7 of the IMDG code Those constructed prior to this date may adhere to Chapter 13 of the earlier IMDG code, specifically up to amendment 29 Certified tank containers meeting these standards are permitted for both road and rail transport.
Additional requirements for offshore service containers
Offshore containers, in addition to meeting the transport requirements outlined in EN 12079, can be specifically designed or equipped for various specialized service tasks, including laboratories, control stations, workshops, accommodation, storage, power plants, and process units.
Service containers, as outlined in paragraph 3.1.2, must adhere to safety regulations relevant to the offshore installations in which they are utilized These regulations can encompass a range of installations, systems, and equipment contained within, including but not limited to various safety measures.
This directive addresses electrical and mechanical issues for offshore containers
[1] IMDG Code, International maritime dangerous goods code (issued by IMO)
[2] IMO/MSC/ Circ.860, Guidelines for approval of offshore containers handled in open seas
[3] DNV, Certification Notes No 2.7-1 — May 1995: Offshore containers
[5] EN 1011-1, Welding - Recommendations for welding of metallic materials - Part 1: General guidance for arc welding
[6] EN 1011-2, Welding - Recommendations for welding of metallic materials - Part 2: Arc welding of ferritic steels
[7] EN 12079-2, Offshore containers and associated lifting sets - Part 2: Lifting sets - Design, manufacture and marking
[8] EN 12079-3, Offshore containers and associated lifting sets - Part 3: Periodic inspection, examination and testing
[9] EN ISO 9001:2000, Quality management systems - Requirements (ISO 9001:2000)
[10] ISO 668, Series 1 freight containers Classification, dimensions and ratings